I tried out the demo in the zip file, and the flashlight still goes through the occlusion. I can see the flashlight leaking through the walls into other rooms.
Viewing post in NixFX Lighting System for GameMaker Studio comments
I'm sorry the importer isn't working for you.
I will include a file called NixFX_Lighting_System_Core..yymps that includes only the minimal files to get the project working. Please try downloading that and see if it works for you. Note that you can just copy the scripts and shaders into your project manually if the importer continues to be buggy.
It works!! Your system is so awesome! I'm really glad I bought it! I can't wait to tweak it to make my game look so much better. I put it in a dungeon room and it is crazy how much it enhances the eerie atmosphere. Thank you for helping me get it imported. If I have more questions should I keep posting them here? or should i reach out elsewhere?